1/*
2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <openssl/idea.h>
11#include "idea_local.h"
12
13void IDEA_cbc_encrypt(const unsigned char *in, unsigned char *out,
14 long length, IDEA_KEY_SCHEDULE *ks, unsigned char *iv,
15 int encrypt)
16{
17 register unsigned long tin0, tin1;
18 register unsigned long tout0, tout1, xor0, xor1;
19 register long l = length;
20 unsigned long tin[2];
21
22 if (encrypt) {
23 n2l(iv, tout0);
24 n2l(iv, tout1);
25 iv -= 8;
26 for (l -= 8; l >= 0; l -= 8) {
27 n2l(in, tin0);
28 n2l(in, tin1);
29 tin0 ^= tout0;
30 tin1 ^= tout1;
31 tin[0] = tin0;
32 tin[1] = tin1;
33 IDEA_encrypt(tin, ks);
34 tout0 = tin[0];
35 l2n(tout0, out);
36 tout1 = tin[1];
37 l2n(tout1, out);
38 }
39 if (l != -8) {
40 n2ln(in, tin0, tin1, l + 8);
41 tin0 ^= tout0;
42 tin1 ^= tout1;
43 tin[0] = tin0;
44 tin[1] = tin1;
45 IDEA_encrypt(tin, ks);
46 tout0 = tin[0];
47 l2n(tout0, out);
48 tout1 = tin[1];
49 l2n(tout1, out);
50 }
51 l2n(tout0, iv);
52 l2n(tout1, iv);
53 } else {
54 n2l(iv, xor0);
55 n2l(iv, xor1);
56 iv -= 8;
57 for (l -= 8; l >= 0; l -= 8) {
58 n2l(in, tin0);
59 tin[0] = tin0;
60 n2l(in, tin1);
61 tin[1] = tin1;
62 IDEA_encrypt(tin, ks);
63 tout0 = tin[0] ^ xor0;
64 tout1 = tin[1] ^ xor1;
65 l2n(tout0, out);
66 l2n(tout1, out);
67 xor0 = tin0;
68 xor1 = tin1;
69 }
70 if (l != -8) {
71 n2l(in, tin0);
72 tin[0] = tin0;
73 n2l(in, tin1);
74 tin[1] = tin1;
75 IDEA_encrypt(tin, ks);
76 tout0 = tin[0] ^ xor0;
77 tout1 = tin[1] ^ xor1;
78 l2nn(tout0, tout1, out, l + 8);
79 xor0 = tin0;
80 xor1 = tin1;
81 }
82 l2n(xor0, iv);
83 l2n(xor1, iv);
84 }
85 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
86 tin[0] = tin[1] = 0;
87}
88
89void IDEA_encrypt(unsigned long *d, IDEA_KEY_SCHEDULE *key)
90{
91 register IDEA_INT *p;
92 register unsigned long x1, x2, x3, x4, t0, t1, ul;
93
94 x2 = d[0];
95 x1 = (x2 >> 16);
96 x4 = d[1];
97 x3 = (x4 >> 16);
98
99 p = &(key->data[0][0]);
100
101 E_IDEA(0);
102 E_IDEA(1);
103 E_IDEA(2);
104 E_IDEA(3);
105 E_IDEA(4);
106 E_IDEA(5);
107 E_IDEA(6);
108 E_IDEA(7);
109
110 x1 &= 0xffff;
111 idea_mul(x1, x1, *p, ul);
112 p++;
113
114 t0 = x3 + *(p++);
115 t1 = x2 + *(p++);
116
117 x4 &= 0xffff;
118 idea_mul(x4, x4, *p, ul);
119
120 d[0] = (t0 & 0xffff) | ((x1 & 0xffff) << 16);
121 d[1] = (x4 & 0xffff) | ((t1 & 0xffff) << 16);
122}
123